when a friend becomes fully integrated into your family
when sib-friends talk to each other: how's mom doing?
...imma live in your basement
by mox+gam November 29, 2020
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the friend who isn’t a brother or a sister but a step brother or sister (you don’t fuck your siblings but you’ll fuck a step sibling)

*Also called a Step Mom(my) or Dad(day)
by Wreck Ralph October 6, 2017
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a dirty sib is when you ejaculate so hard you blow the tip of your dick off
take me to the hospital i pulled a dirty sib
by harry peckerwood September 8, 2021
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A consensual incestuous relationship based on convenience and mutual need rather than romance. Like friends with benefits, only the couple are siblings.
Kelly was tired of having only losers for boyfriends, but she didn't want to be lonely anymore. She asked her cute little brother Eric if he was interested in adding sex to their already close relationship, and he agreed. They weren't in love or anything, it was more of a sibs with benefits arrangement.
by t045t March 16, 2009
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Acronym for "Should I buy"

Used in forums like Reddit as a subject header to ask what is mentioned in the body of the message is worth buying.
SIB Magic Bullet blender/food processor?

Yes, you should buy it, its very handy and useful, without taking up much space.
by Ulfsark July 1, 2017
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A gender-neutral alternative shirt for “sibling” and can substitute for the words “bro” and “sis”. This term can be used with friends as well as a term of endearment.
Heyyyy sib, how’ve you been? It’s been forever!

My friend is NB so I refer to them as sib and they love it.
by LingDanc803 October 22, 2022
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Short for sibling. Instead of saying bro or sis to a close person/relative, you can use this gender neutral word.
My like minded friend: Hey sib, what you doing on Friday?
Me: Haha hey sib, sorry got plans!
by TheRealSlimFati August 18, 2023
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